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B Did the big bang create something from nothing?

  1. Aug 29, 2017 #26

    PeterDonis

    Staff: Mentor

    By spacetime having a geometry in which timelike curves have a finite extent into the past. Currently physicists don't know for sure whether that feature of idealized models based on GR actually applies to our universe; but the models themselves are perfectly consistent, and answer the question you pose here.

    This, as you say, is an assumption. But it is not a necessary assumption, as there are consistent models in which it does not hold. See above.
     
  2. Aug 29, 2017 #27

    PeterDonis

    Staff: Mentor

    The OP question has been sufficiently addressed. Thread closed.
     
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